Do not allow this to continue! Something is miswired or a wire is making contact with something it shouldn't. First step is to go to the hardware store and get an outlet checker - one of those plug in thingies with three little lights. An example is shown below - they all look something like this, though not necessarily exactly. Only a couple bucks. Plug it into any outlet in the TM and check the lights - it will almost certainly show a problem. Now plug it into the 110 v outlet in the garage/carport. If it shows a problem there, then the outlet is miswired. If it doesn't show a problem, then plug the device into the end of the extension cord that you are using to feed the trailer. It also could be bad.
If you know enough about electricity to fix it yourself, that's fine. If not - and it doesn't sound like you do, and that's OK - find (hire) someone who does. This can be truly dangerous. As in lethal.
Bill
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